Re: How to create pages for groups?
Well, one solution would be to have a blog created for the group with all group members set as editors.
The BuddyPress Codex (http://codex.buddypress.org) is run off WP and instead of a normal wiki users log in and are able to edit the pages – revisions are saved thanks to post/page revisions.
It would just need a plugin to add some options to the group admin area; Group Blog settings for example.